Trackball



FIG. 1 is a top front perspective view of a trackball showing my newdesign;

FIG. 2 is a front elevation view thereof, with the rear elevation viewbeing a mirror image thereof;

FIG. 3 is a right elevation view thereof;

FIG. 4 is a left elevation view thereof;

FIG. 5 is a top elevation view thereof; and,

FIG. 6 is a bottom elevation view thereof.

The broken lines shown in the drawings illustrate portions of thetrackball that form no part of the claimed design.

The dash-dot-dash lines in the drawings illustrate a boundary that formsnot part of the claimed design.

CLAIM The ornamental design for a trackball, as shown and described.